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Tankless Coil Piping Arrangement
Boilers may be factory packaged with tankless heater
coil see fi gure below. Coil provides instantaneous heating
of water for domestic use if proper burner and water supply
line controls are used. Tankless coils are meant to provide
domestic hot water for intermittent draws, not continuous
fl ow.
NOTICE
Do not use tankless coil if your water is excessively
hard with lime or other deposits which will
accumulate inside the coil.
When using tankless coil, boiler is confi gured so Honeywell
L7248 operates with Honeywell L4006 low limit mounted
on well installed in tankless heater. Mount factory wired low
limit on well.
Tempering valve (mixing valve) is recommended as shown
below. Flow restrictor may be required on tankless coil inlet
piping so that fl ow rates are matched to boiler heat input
(see table).
DANGER
!
Water temperatures exceeding 125°F will cause
severe burns instantly or death by scalding.
Figure 11 -Tankless Coil Piping Arrangement
SYSTEM PIPING
Boiler
Model
3EW.65
3EW.75
3EW1.00
4EW.90
4EW1.25
4EW1.50
5EW1.20
5EW1.75
‡ Gallons of water per minute heated from 40°F to 140°F with
200°F boiler water temperature, intermittent draw
14
Burner
Input
Input
(MBH)
Rate (gph)
0.65
91
0.75
105
1.00
140
0.90
126
1.25
175
1.50
210
1.20
168
1.75
245
Tankless
Rating
(gpm)‡
2.90
3.00
3.25
3.15
3.50
3.75
3.45
4.00
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